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1 INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS Ornulv (Arnie) Sonsteby, PE & Doron Lean Penn State / FAA Airport.

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Presentation on theme: "1 INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS Ornulv (Arnie) Sonsteby, PE & Doron Lean Penn State / FAA Airport."— Presentation transcript:

1 1 INSTALLATION OF IN-PAVEMENT LIGHTS IN CONCRETE PAVEMENT & IMPACT ON LIGHT PHOTOMETRICS Ornulv (Arnie) Sonsteby, PE & Doron Lean Penn State / FAA Airport Conference 2007

2 2 IPRF-03-1 Project Estimated Completion: 2007 PI & Contact: Ornulv (Arnie) Sonsteby, P.E. Best Practices Guide for In-Pavement Lighting, PCC Pavement Sponsored by: FAA, in Cooperative Agreement with Innovative Pavement Research Foundation (IPRF)

3 3 GUIDE CONTENT Coordination between disciplines Installation in new vs. existing PCC Products, methods, tolerances Boxouts / blockouts Deficiencies and corrective alternatives Strength and load transfer

4 4 Preparing Light Base & Jig

5 5 Light Base Installation (a) “Anchor” function (preparation for paving) (b) “Strengthening” function (completed installation)

6 6 INSTALLATION ISSUES Coordination between disciplines Selecting:  Methods & procedures  lighting products  Pavement materials Tolerances & verification

7 7 CCOORDINATION IN DESIGN Light location vs. pavement joints Materials and method QC/QA Tolerances and Consequences

8 8 PCC JOINT CONFLICTS Touch Down Zone Lights Lead-off / Lead-on TW CTL Lights TW CTL Lights at curves / intersections In-pavement RGL / Stop Bar Lights

9 9 MATERIALS & METHODS Light Base, Conduit, Pavement materials Installation procedures and “structure” -- in new or existing pavement Surface finish (“cookie cutter” vs. Core)

10 10 QC / QA The quality of installation depends on: Good design by engineer Good craftsmanship by installer Close coordination between disciplines Inspection / verification of compliance

11 11 Tolerances and Consequences Pavement vs. Base tolerances Light Base: Location, Height, Azimuth, Level When to modify, when to replace

12 12 Location:Per AC. Depends on type and function of light. Height: Fixture edge even with pavement, (low side): +0”, -1/16. Azimuth:Within ± ½ degree. Level:With horizon. No tolerance specified. Light Tolerances ** Paving elevation tolerance -- + ½”

13 13 Level Tolerance? Pavement has longitudinal grade & cross slope (up to 1.5% major R/Ws) No tolerance in AC. Engineer may establish tolerance (varies) Tolerance applied in wrong direction worsens condition Consider 

14 14 Level !! TRANSVERSE SLOPE LONGITUDINAL GRADE Deg Grade for 12” for 6” Ht  Ht  1/2 0.9% 0.1” 0.05” % 0.2” 0.1” O O

15 15 COORDINATION IN CONSTRUCTION Survey Materials and method QC/QA Tolerances and Consequences

16 16 Coordinate survey activities Survey to:  Locate light  Install light base  Verify before paving Survey

17 17 Selecting Materials & Methods ■Submittals review for compliance ■Establish installation sequence and responsibilities ■Inspection --- more inspection ■Protect lights while completing paving

18 18 Setting base “in space” Conduit in pavement base layer Light base

19 19 Setting bases in “fill-in” lane

20 20 RW Edge Light, Toe-In Installation in existing PCC Pavement

21 21 QC / QA ■Verify light location ■Verify height, azimuth & level while securing light base ■Check tolerances prior to paving ■Inspect surface finish ■Protect light while paving, grooving, sweeping, and marking

22 22 AC 150/ R/W CTL: “The line of lights is offset a maximum of 2’ from the runway centerline to the edge of fixture.” T/W CTL: “Fixtures should be installed so that their nearest edge is approximately 2’ from any rigid pavement joint.” Modeling: (by Tigerbrain) 2’ from Joint Issue

23 23 σ - bottom of 18” thick 20’x20’ slab B-777 (254K edge loading).

24 24 σ - top of 18” thick 20’x20’ slab B-727 (corner loading).

25 25 Joint Issue Comments ■Pavement Design is conservative (edge stress, no load transfer). ■Modeling (with no load transfer between slabs, no bonding to underlying layer): ■Dowels generally reduced max edge stress by ~ 20%. ■With 2 dowels omitted, max edge stress reduced by ~ 12%.

26 26 (Joint Issue Comments continued ) ■Hence: Inside 2’, with 1 or 2 dowels omitted has minimal impact on slab-slab load transfer. ■Load transfer between light base and pavement – assessment suggests non-issue. ■Embedded steel can help control cracking close to joint. ■Alternative: Boxout

27 27 Light near PCC joint PCC Joints Light base 18” 7”

28 28 Cracks Conduit Kerf PCC Joint In-Pavement Light Details, details !!

29 29 Boxout at PCC joint T/W CTL Light

30 30 Normal joints Doweled joint for Boxout Crack Boxout at PCC joints !

31 31 Threshold Light Bar “boxout”

32 32 A few Related concerns

33 33 KERFS Maintain existing pavement joints - for full section of kerf ! PCC Joint

34 34 Longitudinal crack center T/W slab T/W Centerline Light Conduit below !!

35 35 Faulty sealing

36 36 Fate of out-of-tolerance light bases!

37 37 Doron


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